The correct answers are:
1. Launch four EC2 instances: two in one Availability Zone and two in another.
2. Create an Amazon Route 53 multivalue answer routing policy.

Explanation:
To achieve high availability, EC2 instances should be distributed across multiple Availability Zones (AZs) within the same Region. This setup ensures that if one AZ goes down, the other can still serve traffic. Launching instances in multiple AZs helps build fault tolerance.

Using a Route 53 multivalue answer routing policy allows Route 53 to return multiple healthy IP addresses in response to DNS queries. This distributes traffic randomly across all healthy EC2 instances and supports health checks to ensure traffic is only routed to available targets.

Why the other options are incorrect:

Route 53 failover routing policy is intended for active-passive architectures where traffic is routed to a primary resource unless it fails, at which point it fails over to a secondary. This doesnt meet the requirement of distributing traffic randomly across all instances.

Route 53 weighted routing policy is used to send a fixed percentage of traffic to specific endpoints based on assigned weights. This is typically used for gradual rollouts or testing, not for equal random distribution.

Launching three instances with two in one AZ and one in another does not offer optimal fault tolerance. If the AZ with two instances fails, only one instance remains to handle all traffic, creating a performance bottleneck and a potential point of failure.

Why this question is important: It evaluates your ability to design for high availability and fault tolerance using Route 53 and AZ-level redundancyfundamental principles of resilient cloud architecture.

Tip: Distribute workloads across multiple AZs and use multivalue routing for basic load distribution without complex load balancers.

Full AWS Practitioner Certification Question